Note 13 - Fair Value Measurements - Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Reported Value Measurement [Member] \| Cash and Cash Equivalents [Member]
Money market funds	$ 15,500	$ 33,062
Reported Value Measurement [Member] \| Deferred Compensation Trusts [Member]
Investments in employee deferred compensation trusts	5,473	4,467
Estimate of Fair Value Measurement [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member]
Money market funds	15,500	33,062
Estimate of Fair Value Measurement [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member]
Money market funds	0	0
Estimate of Fair Value Measurement [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 3 [Member]
Money market funds	0	0
Estimate of Fair Value Measurement [Member] \| Deferred Compensation Trusts [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments in employee deferred compensation trusts	5,473	4,467
Estimate of Fair Value Measurement [Member] \| Deferred Compensation Trusts [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments in employee deferred compensation trusts	0	0
Estimate of Fair Value Measurement [Member] \| Deferred Compensation Trusts [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments in employee deferred compensation trusts	$ 0	$ 0